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Posted by on Nov 14, 2009 in Infectious diseases

CDC: Up to 34 Million Americans With Pandemic Flu

CDC: Up to 34 Million Americans With Pandemic Flu

Using a model to account for the underascertainment of cases, the CDC now estimates that 14-34 million Americans were infected with the pandemic influenza virus between April and October 17, 2009. The Center previously estimated the number of US cases between April and July 23rd of this year at 1.8-5.7 million.

A breakdown by age (years) shows that pandemic flu has preferentially affected younger adults and children. (The graph provides midlevel estimates of cases [horizontal bars] and estimated ranges [vertical bars].)

H1N1_Case_Estimates_by_Age.pngThe same model was used by the CDC to estimate the number of pandemic flu hospitalizations at 63,000-153,000 and related deaths at 2500-6000 between April and October 17th. Again, an age breakdown reveals that disproportionate numbers of younger adults (and to a lesser extent, children) have been affected with severe pandemic flu.


By using the CDC’s midlevel estimates, the mortality rate of pandemic flu is 0.018%which is consistent with the range of mortality rates provided by Harvard epidemiologist Marc Lipstich (0.007%-0.045%).

One of the latest apparent victims of pandemic flu is University of Ottawa chemistry professor Keith Fagnou, 38, an otherwise healthy father of 3 children. Fagnou died of suspected H1N1 disease on November 11, 3 days after being hospitalized.

HT: In the Pipeline.

bmartin (1130 Posts)

A native East Tennessean, Barbara Martin is a formerly practicing, board-certified neurologist who received her BS (psychology, summa cum laude) and MD from Duke University before completing her postgraduate training (internship, residency, fellowship) at the Hospital of the University of Pennsylvania in Philadelphia. She has worked in academia, private practice, medical publishing, drug market research, and continuing medical education (CME). For the last 3 years, she has worked in a freelance capacity as a medical writer, analyst, and consultant. Follow Dr. Barbara Martin on and Twitter.